Note 5 - Loans (Details) - Non-performing Loans - Nonperforming Financial Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing	$ 1,097	$ 2,301
Non-accrual loans	27,320	31,890
Total non-accrual loans and loans ninety days or more past due and still accruing	28,417	34,191
Mortgage Receivable [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	26,613	30,747
Non-Mortgage Receivables [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	707	1,143
Multi-Family Residential Portfolio Segment[Member]
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing		676
Multi-Family Residential Portfolio Segment[Member] \| Mortgage Receivable [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	6,352	6,878
Commercial Real Estate Portfolio Segment [Member]
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing	416	820
Commercial Real Estate Portfolio Segment [Member] \| Mortgage Receivable [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	2,694	5,689
One-To-Four Family - Mixed-Use Property Portfolio Segment[Member]
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing	353	405
One-To-Four Family - Mixed-Use Property Portfolio Segment[Member] \| Mortgage Receivable [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	6,238	6,936
One-To-Four Family - Residential Portfolio Segment[Member]
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing	13	14
One-To-Four Family - Residential Portfolio Segment[Member] \| Mortgage Receivable [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	11,329	11,244
Commercial Business And Other Portfolio Segment[Member]
Loans ninety days or more past due and still accruing:
Loans ninety days or more past due and still accruing	315	386
Commercial Business And Other Portfolio Segment[Member] \| Non-Mortgage Receivables [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	537	$ 1,143
Small Business Administration Portfolio Segment [Member] \| Non-Mortgage Receivables [Member]
Loans ninety days or more past due and still accruing:
Non-accrual loans	$ 170

No definition available.

Name:	ffic_LoansNinetyDaysOrMorePastDueAndStillAccruingAbstract
Namespace Prefix:	ffic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total non-accrual loans and loans ninety days or more past due and still accruing

+ References

No definition available.

+ Details

Name:	ffic_TotalNonaccrualLoansAndLoansNinetyDaysOrMorePastDueAndStillAccruing
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_MortgageReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=ffic_NonMortgageReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_MultiFamilyResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_OneToFourFamilyMixedUsePropertyPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_OneToFourFamilyResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_CommercialBusinessAndOtherPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_SmallBusinessAdministrationPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: